Table 3 Risk of on-road bicycle crashes in Auckland vs. the rest of New Zealand with stepwise adjustments
Models | Additional variables in the model | Beta estimates (SE) | Hazard ratios (95% CI) | % Attenuation (95% CI)a |
|---|---|---|---|---|
1. Unadjusted | 0.382 (0.073) | 1.47 (1.27, 1.69) | ||
2. Model 1 + demographics | Age | 0.377 (0.073) | 1.46 (1.26, 1.68) | |
Gender | 0.375 (0.073) | 1.46 (1.26, 1.68) | ||
Ethnicity | 0.370 (0.074) | 1.45 (1.25, 1.67) | ||
Education | 0.369 (0.074) | 1.45 (1.25, 1.67) | ||
Body mass index | 0.365 (0.074) | 1.44 (1.25, 1.67) | 4 (−1, 14) | |
3. Model 2 + residential factors | NZDep 2006 scores | 0.368 (0.074) | 1.44 (1.25, 1.67) | |
Urban residence | 0.292 (0.077) | 1.34 (1.15, 1.56) | 24 (11, 49) | |
4. Model 3 + cycling characteristics | Years of cycling | 0.291 (0.077) | 1.34 (1.15, 1.56) | |
Time spent cycling | 0.282 (0.077) | 1.33 (1.14, 1.54) | ||
% cycling off-road | 0.245 (0.078) | 1.28 (1.10, 1.49) | ||
% cycling in the dark | 0.217 (0.079) | 1.24 (1.06, 1.45) | ||
% cycling in a bunch | 0.184 (0.079) | 1.20 (1.03, 1.41) | ||
Cycle to work | 0.192 (0.079) | 1.21 (1.04, 1.42) | ||
Mainly use road bike | 0.193 (0.080) | 1.21 (1.04, 1.42) | ||
Crash history | 0.189 (0.080) | 1.21 (1.03, 1.41) | 51 (21, 74) | |
5. Model 4 + risk behaviours | Use helmet | 0.188 (0.080) | 1.21 (1.03, 1.41) | |
Use fluorescent colours | 0.188 (0.079) | 1.21 (1.03, 1.41) | ||
Use lights in the dark | 0.189 (0.079) | 1.21 (1.03, 1.41) | ||
Use reflective materials in the dark | 0.179 (0.080) | 1.20 (1.02, 1.40) | ||
Listen to music while riding | 0.179 (0.080) | 1.20 (1.02, 1.40) | 53 (20, 72) |